共查询到20条相似文献,搜索用时 62 毫秒
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报道对氧的促进输送膜的研制和膜的性能测定工作。以Co(3FSalen)为氧载体,用简便的方法制备了聚砜-硅橡胶-氧载体复合膜;研究了制备方法和制备条件对膜渗透和分离性能的影响。实验结果表明,促进输送膜能有效地在提高氧氮分离系数α0/N的同时,也提高膜对氧的透气速率P0,采用混合固体氧载体的制膜方法也有独特的优点。 相似文献
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质子的扩散系数、电导率等质子在质子交换膜中的输送参数可以用实验的方法来表征,这些实验技术大多仍停留在用宏观的参数来反映其微观的性能上.运用计算机模拟技术可直接在分子规模描述其输送过程.主要综述了几种质子在质子交换膜中输送过程的模拟方法,讨论了这几种模型在模拟质子输送过程中的一些假设及求解质子输送情况时的大概思路. 相似文献
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Miao Wang Haiqiang Meng Dan Wang Yajun Yin Pieter Stroeve Yunmao Zhang Zhizhi Sheng Baiyi Chen Kan Zhan Xu Hou 《Advanced materials (Deerfield Beach, Fla.)》2019,31(11)
Biological nanochannels control the movements of different ions through cell membranes depending on not only those channels' static inherent configurations, structures, inner surface's physicochemical properties but also their dynamic shape changes, which are required in various essential functions of life processes. Inspired by ion channels, many artificial nanochannel‐based membranes for nanofluidics and biosensing applications have been developed to regulate ionic transport behaviors by using the functional molecular modifications at the inner surface of nanochannel to achieve a stimuli‐responsive layer. Here, the concept of a dynamic nanochannel system is further developed, which is a new way to regulate ion transport in nanochannels by using the dynamic change in the curvature of channels to adjust ionic rectification in real time. The dynamic curvature nanochannel‐based membrane displays the advanced features of the anomalous effect of voltage, concentration, and ionic size for applying simultaneous control over the curvature‐tunable asymmetric and reversible ionic rectification switching properties. This dynamic approach can be used to build smart nanochannel‐based systems, which have strong implications for flexible nanofluidics, ionic rectifiers, and power generators. 相似文献
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聚丙烯微孔膜亲水化研究进展 总被引:1,自引:0,他引:1
以聚丙烯为膜材料制成的微孔膜具有力学性能好、化学稳定等特点,可直接用于电池隔膜和双极膜基材,而经亲水化处理后的聚丙烯微孔膜在水处理工业中显示了更广阔的应用前景。文中介绍了制备聚丙烯微孔膜的热致相分离法和熔融挤出-拉伸法。并针对聚丙烯微孔膜表面亲水化改性方法的特点和工艺条件,进行了较全面地综述,如引发剂引发、臭氧处理、辐射(紫外光、电子束、离子束、γ射线)处理、低温等离子体处理以及共混等。最后简要叙述了聚丙烯膜亲水处理后,微观结构和应用性能的变化。 相似文献
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Nadav Amdursky Debora Marchak Lior Sepunaru Israel Pecht Mordechai Sheves David Cahen 《Advanced materials (Deerfield Beach, Fla.)》2014,26(42):7142-7161
A central vision in molecular electronics is the creation of devices with functional molecular components that may provide unique properties. Proteins are attractive candidates for this purpose, as they have specific physical (optical, electrical) and chemical (selective binding, self‐assembly) functions and offer a myriad of possibilities for (bio‐)chemical modification. This Progress Report focuses on proteins as potential building components for future bioelectronic devices as they are quite efficient electronic conductors, compared with saturated organic molecules. The report addresses several questions: how general is this behavior; how does protein conduction compare with that of saturated and conjugated molecules; and what mechanisms enable efficient conduction across these large molecules? To answer these questions results of nanometer‐scale and macroscopic electronic transport measurements across a range of organic molecules and proteins are compiled and analyzed, from single/few molecules to large molecular ensembles, and the influence of measurement methods on the results is considered. Generalizing, it is found that proteins conduct better than saturated molecules, and somewhat poorer than conjugated molecules. Significantly, the presence of cofactors (redox‐active or conjugated) in the protein enhances their conduction, but without an obvious advantage for natural electron transfer proteins. Most likely, the conduction mechanisms are hopping (at higher temperatures) and tunneling (below ca. 150–200 K). 相似文献
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以聚乙烯醇(PVA)为成膜载体,由聚四氟乙烯(PTFE)分散乳液制得PTFE疏水膜,分析和讨论了膜烧结后的组成、动态力学性能的变化,用扫描电子显微镜(SEM)观察了膜表面形貌。结果表明:(1)制备的PTFE膜较PTFE在组成上无明显变化;(2)经定长和松弛状态烧结的PTFE膜,其DMA谱图的α转变较PTFE未发现较大变化;(3)经定长状态下烧结后所得PTFE膜中原纤网络结点之间构成了较为疏松的微孔结构,而在松弛状态下烧结所得膜的微孔结构较为致密。 相似文献
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Abstract The performance of a cylindrical ion‐selective membrane of arbitrary radius is investigated theoretically. In particular, the effect of the radius of the membrane on its current efficiency is examined without assuming local electroneutrality and Donnan equilibrium. Two types of fixed charge distribution are considered, namely, linear and sinusoidal. The results of numerical simulation reveal that the boundary condition at the axis of a membrane should be assumed appropriately. We show that if the inner radius of a membrane is smaller than its thickness, assuming bulk conditions at the membrane axis is inadequate. Also, the potential drop across a membrane will change its sign, which is disadvantageous to the transport of ions. 相似文献